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Installation manual

ManualsBrandsEmerson ManualsHome building and DecorEpsilon EP Drive 400518-01
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Operational Overview
Figure 23: RMS Foldback Trip Point (this graph is accurate to ±5 percent)
Stall Foldback
Stall Foldback will also be triggered when the drive sees repeated high currents in one of the three motor phases. This
can occur when a motor is moved back and forth between two of its electrical poles.
• For 4 pole motors such as MG-205 or MG-208 this distance is 90º mechanical
• For 6 pole motors such as MG-316 through the MG-4120 this distance is 60º mechanical
• For 8 pole motors this distance is 45º mechanical
Once Stall Foldback is activated, the drive current is reduced to 80 percent of the stall current threshold until the Torque
Command Actual is reduced to less that 70 percent of the stall current threshold for about 200 ms or until the motor
velocity exceeds 100 RPM.
Shunt Operation
Shunt Operation
The EP204 and EP206 drives provide an internal shunt transistor. This transistor is active when the bus voltage reaches
405Vdc and shuts off when the bus voltage falls below 390 Vdc.
External Shunt Operation
The DC bus is accessible for applications requiring additional regenerative power dissipation. Control Techniques offers
an external shunt resistor kit for this use, model number: SM-Heatsink DBR-1. Optionally, the shunt output may be wired
to a customer supplied shunt resistor of appropriate rating.
Shunt Control
An internal shunt control algorithm is used to prevent the external shunt resistor from overloading. It is necessary to
provide the appropriate shunt resistor ratings in the PowerTools Pro software. Default values are in place for the Control
Techniques shunt resistor kit.
Brake Operation
Motor brake operation can be controlled by the Brake Release and Brake Control input functions. These input functions
can be used together to control the state of the Brake output function. The table below shows the relationship between
the Brake input and Brake output functions (see “Diagnostic Display”).
No motion should be commanded while the brake is engaged.
* (1) = Active output function
(0) = Inactive output function
Brake Release Input Off On
Brake Control Input On Off On Off
Drive Power
Stage
Enabled
0111
Disabled
0011